htc_drv_txrx.c

   1/*
   2 * Copyright (c) 2010-2011 Atheros Communications Inc.
   3 *
   4 * Permission to use, copy, modify, and/or distribute this software for any
   5 * purpose with or without fee is hereby granted, provided that the above
   6 * copyright notice and this permission notice appear in all copies.
   7 *
   8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 */
  16
  17#include "htc.h"
  18
  19/******/
  20/* TX */
  21/******/
  22
  23static const int subtype_txq_to_hwq[] = {
  24	[IEEE80211_AC_BE] = ATH_TXQ_AC_BE,
  25	[IEEE80211_AC_BK] = ATH_TXQ_AC_BK,
  26	[IEEE80211_AC_VI] = ATH_TXQ_AC_VI,
  27	[IEEE80211_AC_VO] = ATH_TXQ_AC_VO,
  28};
  29
  30#define ATH9K_HTC_INIT_TXQ(subtype) do {			\
  31		qi.tqi_subtype = subtype_txq_to_hwq[subtype];	\
  32		qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;		\
  33		qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;		\
  34		qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;		\
  35		qi.tqi_physCompBuf = 0;				\
  36		qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |	\
  37			TXQ_FLAG_TXDESCINT_ENABLE;		\
  38	} while (0)
  39
  40int get_hw_qnum(u16 queue, int *hwq_map)
  41{
  42	switch (queue) {
  43	case 0:
  44		return hwq_map[IEEE80211_AC_VO];
  45	case 1:
  46		return hwq_map[IEEE80211_AC_VI];
  47	case 2:
  48		return hwq_map[IEEE80211_AC_BE];
  49	case 3:
  50		return hwq_map[IEEE80211_AC_BK];
  51	default:
  52		return hwq_map[IEEE80211_AC_BE];
  53	}
  54}
  55
  56void ath9k_htc_check_stop_queues(struct ath9k_htc_priv *priv)
  57{
  58	spin_lock_bh(&priv->tx.tx_lock);
  59	priv->tx.queued_cnt++;
  60	if ((priv->tx.queued_cnt >= ATH9K_HTC_TX_THRESHOLD) &&
  61	    !(priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
  62		priv->tx.flags |= ATH9K_HTC_OP_TX_QUEUES_STOP;
  63		ieee80211_stop_queues(priv->hw);
  64	}
  65	spin_unlock_bh(&priv->tx.tx_lock);
  66}
  67
  68void ath9k_htc_check_wake_queues(struct ath9k_htc_priv *priv)
  69{
  70	spin_lock_bh(&priv->tx.tx_lock);
  71	if ((priv->tx.queued_cnt < ATH9K_HTC_TX_THRESHOLD) &&
  72	    (priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
  73		priv->tx.flags &= ~ATH9K_HTC_OP_TX_QUEUES_STOP;
  74		ieee80211_wake_queues(priv->hw);
  75	}
  76	spin_unlock_bh(&priv->tx.tx_lock);
  77}
  78
  79int ath9k_htc_tx_get_slot(struct ath9k_htc_priv *priv)
  80{
  81	int slot;
  82
  83	spin_lock_bh(&priv->tx.tx_lock);
  84	slot = find_first_zero_bit(priv->tx.tx_slot, MAX_TX_BUF_NUM);
  85	if (slot >= MAX_TX_BUF_NUM) {
  86		spin_unlock_bh(&priv->tx.tx_lock);
  87		return -ENOBUFS;
  88	}
  89	__set_bit(slot, priv->tx.tx_slot);
  90	spin_unlock_bh(&priv->tx.tx_lock);
  91
  92	return slot;
  93}
  94
  95void ath9k_htc_tx_clear_slot(struct ath9k_htc_priv *priv, int slot)
  96{
  97	spin_lock_bh(&priv->tx.tx_lock);
  98	__clear_bit(slot, priv->tx.tx_slot);
  99	spin_unlock_bh(&priv->tx.tx_lock);
 100}
 101
 102static inline enum htc_endpoint_id get_htc_epid(struct ath9k_htc_priv *priv,
 103						u16 qnum)
 104{
 105	enum htc_endpoint_id epid;
 106
 107	switch (qnum) {
 108	case 0:
 109		TX_QSTAT_INC(priv, IEEE80211_AC_VO);
 110		epid = priv->data_vo_ep;
 111		break;
 112	case 1:
 113		TX_QSTAT_INC(priv, IEEE80211_AC_VI);
 114		epid = priv->data_vi_ep;
 115		break;
 116	case 2:
 117		TX_QSTAT_INC(priv, IEEE80211_AC_BE);
 118		epid = priv->data_be_ep;
 119		break;
 120	case 3:
 121	default:
 122		TX_QSTAT_INC(priv, IEEE80211_AC_BK);
 123		epid = priv->data_bk_ep;
 124		break;
 125	}
 126
 127	return epid;
 128}
 129
 130static inline struct sk_buff_head*
 131get_htc_epid_queue(struct ath9k_htc_priv *priv, u8 epid)
 132{
 133	struct ath_common *common = ath9k_hw_common(priv->ah);
 134	struct sk_buff_head *epid_queue = NULL;
 135
 136	if (epid == priv->mgmt_ep)
 137		epid_queue = &priv->tx.mgmt_ep_queue;
 138	else if (epid == priv->cab_ep)
 139		epid_queue = &priv->tx.cab_ep_queue;
 140	else if (epid == priv->data_be_ep)
 141		epid_queue = &priv->tx.data_be_queue;
 142	else if (epid == priv->data_bk_ep)
 143		epid_queue = &priv->tx.data_bk_queue;
 144	else if (epid == priv->data_vi_ep)
 145		epid_queue = &priv->tx.data_vi_queue;
 146	else if (epid == priv->data_vo_ep)
 147		epid_queue = &priv->tx.data_vo_queue;
 148	else
 149		ath_err(common, "Invalid EPID: %d\n", epid);
 150
 151	return epid_queue;
 152}
 153
 154/*
 155 * Removes the driver header and returns the TX slot number
 156 */
 157static inline int strip_drv_header(struct ath9k_htc_priv *priv,
 158				   struct sk_buff *skb)
 159{
 160	struct ath_common *common = ath9k_hw_common(priv->ah);
 161	struct ath9k_htc_tx_ctl *tx_ctl;
 162	int slot;
 163
 164	tx_ctl = HTC_SKB_CB(skb);
 165
 166	if (tx_ctl->epid == priv->mgmt_ep) {
 167		struct tx_mgmt_hdr *tx_mhdr =
 168			(struct tx_mgmt_hdr *)skb->data;
 169		slot = tx_mhdr->cookie;
 170		skb_pull(skb, sizeof(struct tx_mgmt_hdr));
 171	} else if ((tx_ctl->epid == priv->data_bk_ep) ||
 172		   (tx_ctl->epid == priv->data_be_ep) ||
 173		   (tx_ctl->epid == priv->data_vi_ep) ||
 174		   (tx_ctl->epid == priv->data_vo_ep) ||
 175		   (tx_ctl->epid == priv->cab_ep)) {
 176		struct tx_frame_hdr *tx_fhdr =
 177			(struct tx_frame_hdr *)skb->data;
 178		slot = tx_fhdr->cookie;
 179		skb_pull(skb, sizeof(struct tx_frame_hdr));
 180	} else {
 181		ath_err(common, "Unsupported EPID: %d\n", tx_ctl->epid);
 182		slot = -EINVAL;
 183	}
 184
 185	return slot;
 186}
 187
 188int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
 189		       struct ath9k_tx_queue_info *qinfo)
 190{
 191	struct ath_hw *ah = priv->ah;
 192	int error = 0;
 193	struct ath9k_tx_queue_info qi;
 194
 195	ath9k_hw_get_txq_props(ah, qnum, &qi);
 196
 197	qi.tqi_aifs = qinfo->tqi_aifs;
 198	qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
 199	qi.tqi_cwmax = qinfo->tqi_cwmax;
 200	qi.tqi_burstTime = qinfo->tqi_burstTime;
 201	qi.tqi_readyTime = qinfo->tqi_readyTime;
 202
 203	if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
 204		ath_err(ath9k_hw_common(ah),
 205			"Unable to update hardware queue %u!\n", qnum);
 206		error = -EIO;
 207	} else {
 208		ath9k_hw_resettxqueue(ah, qnum);
 209	}
 210
 211	return error;
 212}
 213
 214static void ath9k_htc_tx_mgmt(struct ath9k_htc_priv *priv,
 215			      struct ath9k_htc_vif *avp,
 216			      struct sk_buff *skb,
 217			      u8 sta_idx, u8 vif_idx, u8 slot)
 218{
 219	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 220	struct ieee80211_mgmt *mgmt;
 221	struct ieee80211_hdr *hdr;
 222	struct tx_mgmt_hdr mgmt_hdr;
 223	struct ath9k_htc_tx_ctl *tx_ctl;
 224	u8 *tx_fhdr;
 225
 226	tx_ctl = HTC_SKB_CB(skb);
 227	hdr = (struct ieee80211_hdr *) skb->data;
 228
 229	memset(tx_ctl, 0, sizeof(*tx_ctl));
 230	memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
 231
 232	/*
 233	 * Set the TSF adjust value for probe response
 234	 * frame also.
 235	 */
 236	if (avp && unlikely(ieee80211_is_probe_resp(hdr->frame_control))) {
 237		mgmt = (struct ieee80211_mgmt *)skb->data;
 238		mgmt->u.probe_resp.timestamp = avp->tsfadjust;
 239	}
 240
 241	tx_ctl->type = ATH9K_HTC_MGMT;
 242
 243	mgmt_hdr.node_idx = sta_idx;
 244	mgmt_hdr.vif_idx = vif_idx;
 245	mgmt_hdr.tidno = 0;
 246	mgmt_hdr.flags = 0;
 247	mgmt_hdr.cookie = slot;
 248
 249	mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 250	if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 251		mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 252	else
 253		mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
 254
 255	tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
 256	memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
 257	tx_ctl->epid = priv->mgmt_ep;
 258}
 259
 260static void ath9k_htc_tx_data(struct ath9k_htc_priv *priv,
 261			      struct ieee80211_vif *vif,
 262			      struct sk_buff *skb,
 263			      u8 sta_idx, u8 vif_idx, u8 slot,
 264			      bool is_cab)
 265{
 266	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 267	struct ieee80211_hdr *hdr;
 268	struct ath9k_htc_tx_ctl *tx_ctl;
 269	struct tx_frame_hdr tx_hdr;
 270	u32 flags = 0;
 271	u8 *qc, *tx_fhdr;
 272	u16 qnum;
 273
 274	tx_ctl = HTC_SKB_CB(skb);
 275	hdr = (struct ieee80211_hdr *) skb->data;
 276
 277	memset(tx_ctl, 0, sizeof(*tx_ctl));
 278	memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
 279
 280	tx_hdr.node_idx = sta_idx;
 281	tx_hdr.vif_idx = vif_idx;
 282	tx_hdr.cookie = slot;
 283
 284	/*
 285	 * This is a bit redundant but it helps to get
 286	 * the per-packet index quickly when draining the
 287	 * TX queue in the HIF layer. Otherwise we would
 288	 * have to parse the packet contents ...
 289	 */
 290	tx_ctl->sta_idx = sta_idx;
 291
 292	if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 293		tx_ctl->type = ATH9K_HTC_AMPDU;
 294		tx_hdr.data_type = ATH9K_HTC_AMPDU;
 295	} else {
 296		tx_ctl->type = ATH9K_HTC_NORMAL;
 297		tx_hdr.data_type = ATH9K_HTC_NORMAL;
 298	}
 299
 300	/* Transmit all frames that should not be reordered relative
 301	 * to each other using the same priority. For other QoS data
 302	 * frames extract the priority from the header.
 303	 */
 304	if (!(tx_info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) &&
 305	    ieee80211_is_data_qos(hdr->frame_control)) {
 306		qc = ieee80211_get_qos_ctl(hdr);
 307		tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 308	}
 309
 310	/* Check for RTS protection */
 311	if (priv->hw->wiphy->rts_threshold != (u32) -1)
 312		if (skb->len > priv->hw->wiphy->rts_threshold)
 313			flags |= ATH9K_HTC_TX_RTSCTS;
 314
 315	/* CTS-to-self */
 316	if (!(flags & ATH9K_HTC_TX_RTSCTS) &&
 317	    (vif && vif->bss_conf.use_cts_prot))
 318		flags |= ATH9K_HTC_TX_CTSONLY;
 319
 320	tx_hdr.flags = cpu_to_be32(flags);
 321	tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 322	if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 323		tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 324	else
 325		tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
 326
 327	tx_fhdr = skb_push(skb, sizeof(tx_hdr));
 328	memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
 329
 330	if (is_cab) {
 331		CAB_STAT_INC(priv);
 332		tx_ctl->epid = priv->cab_ep;
 333		return;
 334	}
 335
 336	qnum = skb_get_queue_mapping(skb);
 337	tx_ctl->epid = get_htc_epid(priv, qnum);
 338}
 339
 340int ath9k_htc_tx_start(struct ath9k_htc_priv *priv,
 341		       struct ieee80211_sta *sta,
 342		       struct sk_buff *skb,
 343		       u8 slot, bool is_cab)
 344{
 345	struct ieee80211_hdr *hdr;
 346	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 347	struct ieee80211_vif *vif = tx_info->control.vif;
 348	struct ath9k_htc_sta *ista;
 349	struct ath9k_htc_vif *avp = NULL;
 350	u8 sta_idx, vif_idx;
 351
 352	hdr = (struct ieee80211_hdr *) skb->data;
 353
 354	/*
 355	 * Find out on which interface this packet has to be
 356	 * sent out.
 357	 */
 358	if (vif) {
 359		avp = (struct ath9k_htc_vif *) vif->drv_priv;
 360		vif_idx = avp->index;
 361	} else {
 362		if (!priv->ah->is_monitoring) {
 363			ath_dbg(ath9k_hw_common(priv->ah), XMIT,
 364				"VIF is null, but no monitor interface !\n");
 365			return -EINVAL;
 366		}
 367
 368		vif_idx = priv->mon_vif_idx;
 369	}
 370
 371	/*
 372	 * Find out which station this packet is destined for.
 373	 */
 374	if (sta) {
 375		ista = (struct ath9k_htc_sta *) sta->drv_priv;
 376		sta_idx = ista->index;
 377	} else {
 378		sta_idx = priv->vif_sta_pos[vif_idx];
 379	}
 380
 381	if (ieee80211_is_data(hdr->frame_control))
 382		ath9k_htc_tx_data(priv, vif, skb,
 383				  sta_idx, vif_idx, slot, is_cab);
 384	else
 385		ath9k_htc_tx_mgmt(priv, avp, skb,
 386				  sta_idx, vif_idx, slot);
 387
 388
 389	return htc_send(priv->htc, skb);
 390}
 391
 392static inline bool __ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
 393					     struct ath9k_htc_sta *ista, u8 tid)
 394{
 395	bool ret = false;
 396
 397	spin_lock_bh(&priv->tx.tx_lock);
 398	if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
 399		ret = true;
 400	spin_unlock_bh(&priv->tx.tx_lock);
 401
 402	return ret;
 403}
 404
 405static void ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
 406				    struct ieee80211_vif *vif,
 407				    struct sk_buff *skb)
 408{
 409	struct ieee80211_sta *sta;
 410	struct ieee80211_hdr *hdr;
 411	__le16 fc;
 412
 413	hdr = (struct ieee80211_hdr *) skb->data;
 414	fc = hdr->frame_control;
 415
 416	rcu_read_lock();
 417
 418	sta = ieee80211_find_sta(vif, hdr->addr1);
 419	if (!sta) {
 420		rcu_read_unlock();
 421		return;
 422	}
 423
 424	if (sta && conf_is_ht(&priv->hw->conf) &&
 425	    !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 426		if (ieee80211_is_data_qos(fc)) {
 427			u8 *qc, tid;
 428			struct ath9k_htc_sta *ista;
 429
 430			qc = ieee80211_get_qos_ctl(hdr);
 431			tid = qc[0] & 0xf;
 432			ista = (struct ath9k_htc_sta *)sta->drv_priv;
 433			if (__ath9k_htc_check_tx_aggr(priv, ista, tid)) {
 434				ieee80211_start_tx_ba_session(sta, tid, 0);
 435				spin_lock_bh(&priv->tx.tx_lock);
 436				ista->tid_state[tid] = AGGR_PROGRESS;
 437				spin_unlock_bh(&priv->tx.tx_lock);
 438			}
 439		}
 440	}
 441
 442	rcu_read_unlock();
 443}
 444
 445static void ath9k_htc_tx_process(struct ath9k_htc_priv *priv,
 446				 struct sk_buff *skb,
 447				 struct __wmi_event_txstatus *txs)
 448{
 449	struct ieee80211_vif *vif;
 450	struct ath9k_htc_tx_ctl *tx_ctl;
 451	struct ieee80211_tx_info *tx_info;
 452	struct ieee80211_tx_rate *rate;
 453	struct ieee80211_conf *cur_conf = &priv->hw->conf;
 454	bool txok;
 455	int slot;
 456	int hdrlen, padsize;
 457
 458	slot = strip_drv_header(priv, skb);
 459	if (slot < 0) {
 460		dev_kfree_skb_any(skb);
 461		return;
 462	}
 463
 464	tx_ctl = HTC_SKB_CB(skb);
 465	txok = tx_ctl->txok;
 466	tx_info = IEEE80211_SKB_CB(skb);
 467	vif = tx_info->control.vif;
 468	rate = &tx_info->status.rates[0];
 469
 470	memset(&tx_info->status, 0, sizeof(tx_info->status));
 471
 472	/*
 473	 * URB submission failed for this frame, it never reached
 474	 * the target.
 475	 */
 476	if (!txok || !vif || !txs)
 477		goto send_mac80211;
 478
 479	if (txs->ts_flags & ATH9K_HTC_TXSTAT_ACK) {
 480		tx_info->flags |= IEEE80211_TX_STAT_ACK;
 481		if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
 482			tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 483	}
 484
 485	if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT)
 486		tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 487
 488	if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS)
 489		rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
 490
 491	rate->count = 1;
 492	rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE);
 493
 494	if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) {
 495		rate->flags |= IEEE80211_TX_RC_MCS;
 496
 497		if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40)
 498			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 499		if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI)
 500			rate->flags |= IEEE80211_TX_RC_SHORT_GI;
 501	} else {
 502		if (cur_conf->chandef.chan->band == NL80211_BAND_5GHZ)
 503			rate->idx += 4; /* No CCK rates */
 504	}
 505
 506	ath9k_htc_check_tx_aggr(priv, vif, skb);
 507
 508send_mac80211:
 509	spin_lock_bh(&priv->tx.tx_lock);
 510	if (WARN_ON(--priv->tx.queued_cnt < 0))
 511		priv->tx.queued_cnt = 0;
 512	spin_unlock_bh(&priv->tx.tx_lock);
 513
 514	ath9k_htc_tx_clear_slot(priv, slot);
 515
 516	/* Remove padding before handing frame back to mac80211 */
 517	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 518
 519	padsize = hdrlen & 3;
 520	if (padsize && skb->len > hdrlen + padsize) {
 521		memmove(skb->data + padsize, skb->data, hdrlen);
 522		skb_pull(skb, padsize);
 523	}
 524
 525	/* Send status to mac80211 */
 526	ieee80211_tx_status_skb(priv->hw, skb);
 527}
 528
 529static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv,
 530				       struct sk_buff_head *queue)
 531{
 532	struct sk_buff *skb;
 533
 534	while ((skb = skb_dequeue(queue)) != NULL) {
 535		ath9k_htc_tx_process(priv, skb, NULL);
 536	}
 537}
 538
 539void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
 540{
 541	struct ath9k_htc_tx_event *event, *tmp;
 542
 543	spin_lock_bh(&priv->tx.tx_lock);
 544	priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN;
 545	spin_unlock_bh(&priv->tx.tx_lock);
 546
 547	/*
 548	 * Ensure that all pending TX frames are flushed,
 549	 * and that the TX completion/failed tasklets is killed.
 550	 */
 551	htc_stop(priv->htc);
 552	tasklet_kill(&priv->wmi->wmi_event_tasklet);
 553	tasklet_kill(&priv->tx_failed_tasklet);
 554
 555	ath9k_htc_tx_drainq(priv, &priv->tx.mgmt_ep_queue);
 556	ath9k_htc_tx_drainq(priv, &priv->tx.cab_ep_queue);
 557	ath9k_htc_tx_drainq(priv, &priv->tx.data_be_queue);
 558	ath9k_htc_tx_drainq(priv, &priv->tx.data_bk_queue);
 559	ath9k_htc_tx_drainq(priv, &priv->tx.data_vi_queue);
 560	ath9k_htc_tx_drainq(priv, &priv->tx.data_vo_queue);
 561	ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
 562
 563	/*
 564	 * The TX cleanup timer has already been killed.
 565	 */
 566	spin_lock_bh(&priv->wmi->event_lock);
 567	list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
 568		list_del(&event->list);
 569		kfree(event);
 570	}
 571	spin_unlock_bh(&priv->wmi->event_lock);
 572
 573	spin_lock_bh(&priv->tx.tx_lock);
 574	priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN;
 575	spin_unlock_bh(&priv->tx.tx_lock);
 576}
 577
 578void ath9k_tx_failed_tasklet(struct tasklet_struct *t)
 579{
 580	struct ath9k_htc_priv *priv = from_tasklet(priv, t, tx_failed_tasklet);
 581
 582	spin_lock(&priv->tx.tx_lock);
 583	if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
 584		spin_unlock(&priv->tx.tx_lock);
 585		return;
 586	}
 587	spin_unlock(&priv->tx.tx_lock);
 588
 589	ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
 590}
 591
 592static inline bool check_cookie(struct ath9k_htc_priv *priv,
 593				struct sk_buff *skb,
 594				u8 cookie, u8 epid)
 595{
 596	u8 fcookie = 0;
 597
 598	if (epid == priv->mgmt_ep) {
 599		struct tx_mgmt_hdr *hdr;
 600		hdr = (struct tx_mgmt_hdr *) skb->data;
 601		fcookie = hdr->cookie;
 602	} else if ((epid == priv->data_bk_ep) ||
 603		   (epid == priv->data_be_ep) ||
 604		   (epid == priv->data_vi_ep) ||
 605		   (epid == priv->data_vo_ep) ||
 606		   (epid == priv->cab_ep)) {
 607		struct tx_frame_hdr *hdr;
 608		hdr = (struct tx_frame_hdr *) skb->data;
 609		fcookie = hdr->cookie;
 610	}
 611
 612	if (fcookie == cookie)
 613		return true;
 614
 615	return false;
 616}
 617
 618static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv,
 619					       struct __wmi_event_txstatus *txs)
 620{
 621	struct ath_common *common = ath9k_hw_common(priv->ah);
 622	struct sk_buff_head *epid_queue;
 623	struct sk_buff *skb, *tmp;
 624	unsigned long flags;
 625	u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID);
 626
 627	epid_queue = get_htc_epid_queue(priv, epid);
 628	if (!epid_queue)
 629		return NULL;
 630
 631	spin_lock_irqsave(&epid_queue->lock, flags);
 632	skb_queue_walk_safe(epid_queue, skb, tmp) {
 633		if (check_cookie(priv, skb, txs->cookie, epid)) {
 634			__skb_unlink(skb, epid_queue);
 635			spin_unlock_irqrestore(&epid_queue->lock, flags);
 636			return skb;
 637		}
 638	}
 639	spin_unlock_irqrestore(&epid_queue->lock, flags);
 640
 641	ath_dbg(common, XMIT, "No matching packet for cookie: %d, epid: %d\n",
 642		txs->cookie, epid);
 643
 644	return NULL;
 645}
 646
 647void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
 648{
 649	struct wmi_event_txstatus *txs = wmi_event;
 650	struct __wmi_event_txstatus *__txs;
 651	struct sk_buff *skb;
 652	struct ath9k_htc_tx_event *tx_pend;
 653	int i;
 654
 655	if (WARN_ON_ONCE(txs->cnt > HTC_MAX_TX_STATUS))
 656		return;
 657
 658	for (i = 0; i < txs->cnt; i++) {
 659		__txs = &txs->txstatus[i];
 660
 661		skb = ath9k_htc_tx_get_packet(priv, __txs);
 662		if (!skb) {
 663			/*
 664			 * Store this event, so that the TX cleanup
 665			 * routine can check later for the needed packet.
 666			 */
 667			tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event),
 668					  GFP_ATOMIC);
 669			if (!tx_pend)
 670				continue;
 671
 672			memcpy(&tx_pend->txs, __txs,
 673			       sizeof(struct __wmi_event_txstatus));
 674
 675			spin_lock(&priv->wmi->event_lock);
 676			list_add_tail(&tx_pend->list,
 677				      &priv->wmi->pending_tx_events);
 678			spin_unlock(&priv->wmi->event_lock);
 679
 680			continue;
 681		}
 682
 683		ath9k_htc_tx_process(priv, skb, __txs);
 684	}
 685
 686	/* Wake TX queues if needed */
 687	ath9k_htc_check_wake_queues(priv);
 688}
 689
 690void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
 691		    enum htc_endpoint_id ep_id, bool txok)
 692{
 693	struct ath9k_htc_priv *priv = drv_priv;
 694	struct ath9k_htc_tx_ctl *tx_ctl;
 695	struct sk_buff_head *epid_queue;
 696
 697	tx_ctl = HTC_SKB_CB(skb);
 698	tx_ctl->txok = txok;
 699	tx_ctl->timestamp = jiffies;
 700
 701	if (!txok) {
 702		skb_queue_tail(&priv->tx.tx_failed, skb);
 703		tasklet_schedule(&priv->tx_failed_tasklet);
 704		return;
 705	}
 706
 707	epid_queue = get_htc_epid_queue(priv, ep_id);
 708	if (!epid_queue) {
 709		dev_kfree_skb_any(skb);
 710		return;
 711	}
 712
 713	skb_queue_tail(epid_queue, skb);
 714}
 715
 716static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb)
 717{
 718	struct ath_common *common = ath9k_hw_common(priv->ah);
 719	struct ath9k_htc_tx_ctl *tx_ctl;
 720
 721	tx_ctl = HTC_SKB_CB(skb);
 722
 723	if (time_after(jiffies,
 724		       tx_ctl->timestamp +
 725		       msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) {
 726		ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n");
 727		return true;
 728	}
 729
 730	return false;
 731}
 732
 733static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv,
 734				       struct sk_buff_head *epid_queue)
 735{
 736	bool process = false;
 737	unsigned long flags;
 738	struct sk_buff *skb, *tmp;
 739	struct sk_buff_head queue;
 740
 741	skb_queue_head_init(&queue);
 742
 743	spin_lock_irqsave(&epid_queue->lock, flags);
 744	skb_queue_walk_safe(epid_queue, skb, tmp) {
 745		if (check_packet(priv, skb)) {
 746			__skb_unlink(skb, epid_queue);
 747			__skb_queue_tail(&queue, skb);
 748			process = true;
 749		}
 750	}
 751	spin_unlock_irqrestore(&epid_queue->lock, flags);
 752
 753	if (process) {
 754		skb_queue_walk_safe(&queue, skb, tmp) {
 755			__skb_unlink(skb, &queue);
 756			ath9k_htc_tx_process(priv, skb, NULL);
 757		}
 758	}
 759}
 760
 761void ath9k_htc_tx_cleanup_timer(struct timer_list *t)
 762{
 763	struct ath9k_htc_priv *priv = timer_container_of(priv, t,
 764							 tx.cleanup_timer);
 765	struct ath_common *common = ath9k_hw_common(priv->ah);
 766	struct ath9k_htc_tx_event *event, *tmp;
 767	struct sk_buff *skb;
 768
 769	spin_lock(&priv->wmi->event_lock);
 770	list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
 771
 772		skb = ath9k_htc_tx_get_packet(priv, &event->txs);
 773		if (skb) {
 774			ath_dbg(common, XMIT,
 775				"Found packet for cookie: %d, epid: %d\n",
 776				event->txs.cookie,
 777				MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID));
 778
 779			ath9k_htc_tx_process(priv, skb, &event->txs);
 780			list_del(&event->list);
 781			kfree(event);
 782			continue;
 783		}
 784
 785		if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) {
 786			list_del(&event->list);
 787			kfree(event);
 788		}
 789	}
 790	spin_unlock(&priv->wmi->event_lock);
 791
 792	/*
 793	 * Check if status-pending packets have to be cleaned up.
 794	 */
 795	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue);
 796	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue);
 797	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue);
 798	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue);
 799	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue);
 800	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue);
 801
 802	/* Wake TX queues if needed */
 803	ath9k_htc_check_wake_queues(priv);
 804
 805	mod_timer(&priv->tx.cleanup_timer,
 806		  jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL));
 807}
 808
 809int ath9k_tx_init(struct ath9k_htc_priv *priv)
 810{
 811	skb_queue_head_init(&priv->tx.mgmt_ep_queue);
 812	skb_queue_head_init(&priv->tx.cab_ep_queue);
 813	skb_queue_head_init(&priv->tx.data_be_queue);
 814	skb_queue_head_init(&priv->tx.data_bk_queue);
 815	skb_queue_head_init(&priv->tx.data_vi_queue);
 816	skb_queue_head_init(&priv->tx.data_vo_queue);
 817	skb_queue_head_init(&priv->tx.tx_failed);
 818
 819	return 0;
 820}
 821
 822void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
 823{
 824
 825}
 826
 827bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
 828{
 829	struct ath_hw *ah = priv->ah;
 830	struct ath_common *common = ath9k_hw_common(ah);
 831	struct ath9k_tx_queue_info qi;
 832	int qnum;
 833
 834	memset(&qi, 0, sizeof(qi));
 835	ATH9K_HTC_INIT_TXQ(subtype);
 836
 837	qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
 838	if (qnum == -1)
 839		return false;
 840
 841	if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
 842		ath_err(common, "qnum %u out of range, max %zu!\n",
 843			qnum, ARRAY_SIZE(priv->hwq_map));
 844		ath9k_hw_releasetxqueue(ah, qnum);
 845		return false;
 846	}
 847
 848	priv->hwq_map[subtype] = qnum;
 849	return true;
 850}
 851
 852int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
 853{
 854	struct ath9k_tx_queue_info qi;
 855
 856	memset(&qi, 0, sizeof(qi));
 857	ATH9K_HTC_INIT_TXQ(0);
 858
 859	return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
 860}
 861
 862/******/
 863/* RX */
 864/******/
 865
 866/*
 867 * Calculate the RX filter to be set in the HW.
 868 */
 869u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
 870{
 871#define	RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
 872
 873	struct ath_hw *ah = priv->ah;
 874	u32 rfilt;
 875
 876	rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
 877		| ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
 878		| ATH9K_RX_FILTER_MCAST;
 879
 880	if (priv->rxfilter & FIF_PROBE_REQ)
 881		rfilt |= ATH9K_RX_FILTER_PROBEREQ;
 882
 883	if (ah->is_monitoring)
 884		rfilt |= ATH9K_RX_FILTER_PROM;
 885
 886	if (priv->rxfilter & FIF_CONTROL)
 887		rfilt |= ATH9K_RX_FILTER_CONTROL;
 888
 889	if ((ah->opmode == NL80211_IFTYPE_STATION) &&
 890	    (priv->nvifs <= 1) &&
 891	    !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
 892		rfilt |= ATH9K_RX_FILTER_MYBEACON;
 893	else
 894		rfilt |= ATH9K_RX_FILTER_BEACON;
 895
 896	if (conf_is_ht(&priv->hw->conf)) {
 897		rfilt |= ATH9K_RX_FILTER_COMP_BAR;
 898		rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
 899	}
 900
 901	if (priv->rxfilter & FIF_PSPOLL)
 902		rfilt |= ATH9K_RX_FILTER_PSPOLL;
 903
 904	if (priv->nvifs > 1 ||
 905	    priv->rxfilter & (FIF_OTHER_BSS | FIF_MCAST_ACTION))
 906		rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
 907
 908	return rfilt;
 909
 910#undef RX_FILTER_PRESERVE
 911}
 912
 913/*
 914 * Recv initialization for opmode change.
 915 */
 916static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
 917{
 918	struct ath_hw *ah = priv->ah;
 919	u32 rfilt, mfilt[2];
 920
 921	/* configure rx filter */
 922	rfilt = ath9k_htc_calcrxfilter(priv);
 923	ath9k_hw_setrxfilter(ah, rfilt);
 924
 925	/* calculate and install multicast filter */
 926	mfilt[0] = mfilt[1] = ~0;
 927	ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
 928}
 929
 930void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
 931{
 932	struct ath_common *common = ath9k_hw_common(priv->ah);
 933	ath9k_hw_rxena(priv->ah);
 934	ath9k_htc_opmode_init(priv);
 935	ath9k_hw_startpcureceive(priv->ah, test_bit(ATH_OP_SCANNING, &common->op_flags));
 936}
 937
 938static inline void convert_htc_flag(struct ath_rx_status *rx_stats,
 939				   struct ath_htc_rx_status *rxstatus)
 940{
 941	rx_stats->enc_flags = 0;
 942	rx_stats->bw = RATE_INFO_BW_20;
 943	if (rxstatus->rs_flags & ATH9K_RX_2040)
 944		rx_stats->bw = RATE_INFO_BW_40;
 945	if (rxstatus->rs_flags & ATH9K_RX_GI)
 946		rx_stats->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 947}
 948
 949static void rx_status_htc_to_ath(struct ath_rx_status *rx_stats,
 950				 struct ath_htc_rx_status *rxstatus)
 951{
 952	rx_stats->rs_datalen	= be16_to_cpu(rxstatus->rs_datalen);
 953	rx_stats->rs_status	= rxstatus->rs_status;
 954	rx_stats->rs_phyerr	= rxstatus->rs_phyerr;
 955	rx_stats->rs_rssi	= rxstatus->rs_rssi;
 956	rx_stats->rs_keyix	= rxstatus->rs_keyix;
 957	rx_stats->rs_rate	= rxstatus->rs_rate;
 958	rx_stats->rs_antenna	= rxstatus->rs_antenna;
 959	rx_stats->rs_more	= rxstatus->rs_more;
 960
 961	memcpy(rx_stats->rs_rssi_ctl, rxstatus->rs_rssi_ctl,
 962		sizeof(rx_stats->rs_rssi_ctl));
 963	memcpy(rx_stats->rs_rssi_ext, rxstatus->rs_rssi_ext,
 964		sizeof(rx_stats->rs_rssi_ext));
 965
 966	rx_stats->rs_isaggr	= rxstatus->rs_isaggr;
 967	rx_stats->rs_moreaggr	= rxstatus->rs_moreaggr;
 968	rx_stats->rs_num_delims	= rxstatus->rs_num_delims;
 969	convert_htc_flag(rx_stats, rxstatus);
 970}
 971
 972static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
 973			     struct ath9k_htc_rxbuf *rxbuf,
 974			     struct ieee80211_rx_status *rx_status)
 975
 976{
 977	struct ieee80211_hdr *hdr;
 978	struct ieee80211_hw *hw = priv->hw;
 979	struct sk_buff *skb = rxbuf->skb;
 980	struct ath_common *common = ath9k_hw_common(priv->ah);
 981	struct ath_hw *ah = common->ah;
 982	struct ath_htc_rx_status *rxstatus;
 983	struct ath_rx_status rx_stats;
 984	bool decrypt_error = false;
 985	u16 rs_datalen;
 986	bool is_phyerr;
 987
 988	if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
 989		ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
 990			skb->len);
 991		goto rx_next;
 992	}
 993
 994	rxstatus = (struct ath_htc_rx_status *)skb->data;
 995
 996	rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
 997	if (unlikely(rs_datalen -
 998	    (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0)) {
 999		ath_err(common,
1000			"Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
1001			rs_datalen, skb->len);
1002		goto rx_next;
1003	}
1004
1005	is_phyerr = rxstatus->rs_status & ATH9K_RXERR_PHY;
1006	/*
1007	 * Discard zero-length packets and packets smaller than an ACK
1008	 * which are not PHY_ERROR (short radar pulses have a length of 3)
1009	 */
1010	if (unlikely(!rs_datalen || (rs_datalen < 10 && !is_phyerr))) {
1011		ath_dbg(common, ANY,
1012			"Short RX data len, dropping (dlen: %d)\n",
1013			rs_datalen);
1014		goto rx_next;
1015	}
1016
1017	if (rxstatus->rs_keyix >= ATH_KEYMAX &&
1018	    rxstatus->rs_keyix != ATH9K_RXKEYIX_INVALID) {
1019		ath_dbg(common, ANY,
1020			"Invalid keyix, dropping (keyix: %d)\n",
1021			rxstatus->rs_keyix);
1022		goto rx_next;
1023	}
1024
1025	/* Get the RX status information */
1026
1027	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
1028
1029	/* Copy everything from ath_htc_rx_status (HTC_RX_FRAME_HEADER).
1030	 * After this, we can drop this part of skb. */
1031	rx_status_htc_to_ath(&rx_stats, rxstatus);
1032	ath9k_htc_err_stat_rx(priv, &rx_stats);
1033	rx_status->mactime = be64_to_cpu(rxstatus->rs_tstamp);
1034	skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
1035
1036	/*
1037	 * everything but the rate is checked here, the rate check is done
1038	 * separately to avoid doing two lookups for a rate for each frame.
1039	 */
1040	hdr = (struct ieee80211_hdr *)skb->data;
1041
1042	/*
1043	 * Process PHY errors and return so that the packet
1044	 * can be dropped.
1045	 */
1046	if (unlikely(is_phyerr)) {
1047		/* TODO: Not using DFS processing now. */
1048		if (ath_cmn_process_fft(&priv->spec_priv, hdr,
1049				    &rx_stats, rx_status->mactime)) {
1050			/* TODO: Code to collect spectral scan statistics */
1051		}
1052		goto rx_next;
1053	}
1054
1055	if (!ath9k_cmn_rx_accept(common, hdr, rx_status, &rx_stats,
1056			&decrypt_error, priv->rxfilter))
1057		goto rx_next;
1058
1059	ath9k_cmn_rx_skb_postprocess(common, skb, &rx_stats,
1060				     rx_status, decrypt_error);
1061
1062	if (ath9k_cmn_process_rate(common, hw, &rx_stats, rx_status))
1063		goto rx_next;
1064
1065	rx_stats.is_mybeacon = ath_is_mybeacon(common, hdr);
1066	ath9k_cmn_process_rssi(common, hw, &rx_stats, rx_status);
1067
1068	rx_status->band = ah->curchan->chan->band;
1069	rx_status->freq = ah->curchan->chan->center_freq;
1070	rx_status->antenna = rx_stats.rs_antenna;
1071	rx_status->flag |= RX_FLAG_MACTIME_END;
1072
1073	return true;
1074rx_next:
1075	return false;
1076}
1077
1078/*
1079 * FIXME: Handle FLUSH later on.
1080 */
1081void ath9k_rx_tasklet(struct tasklet_struct *t)
1082{
1083	struct ath9k_htc_priv *priv = from_tasklet(priv, t, rx_tasklet);
1084	struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1085	struct ieee80211_rx_status rx_status;
1086	struct sk_buff *skb;
1087	unsigned long flags;
1088	struct ieee80211_hdr *hdr;
1089
1090	do {
1091		spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1092		list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1093			if (tmp_buf->in_process) {
1094				rxbuf = tmp_buf;
1095				break;
1096			}
1097		}
1098
1099		if (rxbuf == NULL) {
1100			spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1101			break;
1102		}
1103
1104		if (!rxbuf->skb)
1105			goto requeue;
1106
1107		if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
1108			dev_kfree_skb_any(rxbuf->skb);
1109			goto requeue;
1110		}
1111
1112		memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
1113		       sizeof(struct ieee80211_rx_status));
1114		skb = rxbuf->skb;
1115		hdr = (struct ieee80211_hdr *) skb->data;
1116
1117		if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
1118				ieee80211_queue_work(priv->hw, &priv->ps_work);
1119
1120		spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1121
1122		ieee80211_rx(priv->hw, skb);
1123
1124		spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1125requeue:
1126		rxbuf->in_process = false;
1127		rxbuf->skb = NULL;
1128		list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
1129		rxbuf = NULL;
1130		spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1131	} while (1);
1132
1133}
1134
1135void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
1136		    enum htc_endpoint_id ep_id)
1137{
1138	struct ath9k_htc_priv *priv = drv_priv;
1139	struct ath_hw *ah = priv->ah;
1140	struct ath_common *common = ath9k_hw_common(ah);
1141	struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1142	unsigned long flags;
1143
1144	/* Check if ath9k_rx_init() completed. */
1145	if (!data_race(priv->rx.initialized))
1146		goto err;
1147
1148	spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1149	list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1150		if (!tmp_buf->in_process) {
1151			rxbuf = tmp_buf;
1152			break;
1153		}
1154	}
1155	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1156
1157	if (rxbuf == NULL) {
1158		ath_dbg(common, ANY, "No free RX buffer\n");
1159		goto err;
1160	}
1161
1162	spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1163	rxbuf->skb = skb;
1164	rxbuf->in_process = true;
1165	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1166
1167	tasklet_schedule(&priv->rx_tasklet);
1168	return;
1169err:
1170	dev_kfree_skb_any(skb);
1171}
1172
1173/* FIXME: Locking for cleanup/init */
1174
1175void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
1176{
1177	struct ath9k_htc_rxbuf *rxbuf, *tbuf;
1178
1179	list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
1180		list_del(&rxbuf->list);
1181		if (rxbuf->skb)
1182			dev_kfree_skb_any(rxbuf->skb);
1183		kfree(rxbuf);
1184	}
1185}
1186
1187int ath9k_rx_init(struct ath9k_htc_priv *priv)
1188{
1189	int i = 0;
1190
1191	INIT_LIST_HEAD(&priv->rx.rxbuf);
1192	spin_lock_init(&priv->rx.rxbuflock);
1193
1194	for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
1195		struct ath9k_htc_rxbuf *rxbuf =
1196			kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
1197		if (rxbuf == NULL)
1198			goto err;
1199
1200		list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
1201	}
1202
1203	/* Allow ath9k_htc_rxep() to operate. */
1204	smp_wmb();
1205	priv->rx.initialized = true;
1206
1207	return 0;
1208
1209err:
1210	ath9k_rx_cleanup(priv);
1211	return -ENOMEM;
1212}